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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5143e9862109133015a8cbf71dc2fb6475ab502e3f4310aeb831cbdd445dd026' 
  AND token = 'gJfHrISLzXUX68/84DHlMdEoqtA6yo5gDn82gAXj4nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}